/Engine/Source/Developer/AutomationDriver/Public/IDriverElement.h
Moves focus to the element, then triggers the series of events to invoke keyboard input for releasing the specified key. The key will not be pressed if it is not currently being pressed.
whether the release was successful
[TAsyncResult](API\Runtime\Core\Async\TAsyncResult)< bool > Release ( [FKey](API\Runtime\InputCore\FKey) Key )